src/HOL/Lifting.thy
author kuncar
Wed Jun 05 15:21:52 2013 +0200 (2013-06-05)
changeset 52307 32c433c38ddd
parent 52036 1aa2e40df9ff
child 53011 aeee0a4be6cf
permissions -rw-r--r--
more reflexivity rules (for OO)
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(*  Title:      HOL/Lifting.thy
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    Author:     Brian Huffman and Ondrej Kuncar
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    Author:     Cezary Kaliszyk and Christian Urban
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*)
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header {* Lifting package *}
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theory Lifting
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imports Equiv_Relations Transfer
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keywords
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  "parametric" and
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  "print_quotmaps" "print_quotients" :: diag and
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  "lift_definition" :: thy_goal and
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  "setup_lifting" :: thy_decl
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begin
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subsection {* Function map *}
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notation map_fun (infixr "--->" 55)
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lemma map_fun_id:
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  "(id ---> id) = id"
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  by (simp add: fun_eq_iff)
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subsection {* Other predicates on relations *}
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definition left_total :: "('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> bool"
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  where "left_total R \<longleftrightarrow> (\<forall>x. \<exists>y. R x y)"
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lemma left_totalI:
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  "(\<And>x. \<exists>y. R x y) \<Longrightarrow> left_total R"
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unfolding left_total_def by blast
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lemma left_totalE:
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  assumes "left_total R"
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  obtains "(\<And>x. \<exists>y. R x y)"
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using assms unfolding left_total_def by blast
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definition left_unique :: "('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> bool"
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  where "left_unique R \<longleftrightarrow> (\<forall>x y z. R x z \<longrightarrow> R y z \<longrightarrow> x = y)"
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lemma left_total_fun:
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  "\<lbrakk>left_unique A; left_total B\<rbrakk> \<Longrightarrow> left_total (A ===> B)"
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  unfolding left_total_def fun_rel_def
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  apply (rule allI, rename_tac f)
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  apply (rule_tac x="\<lambda>y. SOME z. B (f (THE x. A x y)) z" in exI)
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  apply clarify
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  apply (subgoal_tac "(THE x. A x y) = x", simp)
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  apply (rule someI_ex)
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  apply (simp)
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  apply (rule the_equality)
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  apply assumption
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  apply (simp add: left_unique_def)
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  done
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lemma left_unique_fun:
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  "\<lbrakk>left_total A; left_unique B\<rbrakk> \<Longrightarrow> left_unique (A ===> B)"
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  unfolding left_total_def left_unique_def fun_rel_def
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  by (clarify, rule ext, fast)
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lemma left_total_eq: "left_total op=" unfolding left_total_def by blast
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lemma left_unique_eq: "left_unique op=" unfolding left_unique_def by blast
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subsection {* Quotient Predicate *}
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definition
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  "Quotient R Abs Rep T \<longleftrightarrow>
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     (\<forall>a. Abs (Rep a) = a) \<and> 
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     (\<forall>a. R (Rep a) (Rep a)) \<and>
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     (\<forall>r s. R r s \<longleftrightarrow> R r r \<and> R s s \<and> Abs r = Abs s) \<and>
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     T = (\<lambda>x y. R x x \<and> Abs x = y)"
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lemma QuotientI:
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  assumes "\<And>a. Abs (Rep a) = a"
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    and "\<And>a. R (Rep a) (Rep a)"
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    and "\<And>r s. R r s \<longleftrightarrow> R r r \<and> R s s \<and> Abs r = Abs s"
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    and "T = (\<lambda>x y. R x x \<and> Abs x = y)"
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  shows "Quotient R Abs Rep T"
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  using assms unfolding Quotient_def by blast
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context
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  fixes R Abs Rep T
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  assumes a: "Quotient R Abs Rep T"
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begin
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lemma Quotient_abs_rep: "Abs (Rep a) = a"
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  using a unfolding Quotient_def
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  by simp
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lemma Quotient_rep_reflp: "R (Rep a) (Rep a)"
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  using a unfolding Quotient_def
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  by blast
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lemma Quotient_rel:
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  "R r r \<and> R s s \<and> Abs r = Abs s \<longleftrightarrow> R r s" -- {* orientation does not loop on rewriting *}
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  using a unfolding Quotient_def
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  by blast
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lemma Quotient_cr_rel: "T = (\<lambda>x y. R x x \<and> Abs x = y)"
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  using a unfolding Quotient_def
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  by blast
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lemma Quotient_refl1: "R r s \<Longrightarrow> R r r"
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  using a unfolding Quotient_def
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  by fast
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lemma Quotient_refl2: "R r s \<Longrightarrow> R s s"
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  using a unfolding Quotient_def
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  by fast
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lemma Quotient_rel_rep: "R (Rep a) (Rep b) \<longleftrightarrow> a = b"
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  using a unfolding Quotient_def
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  by metis
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lemma Quotient_rep_abs: "R r r \<Longrightarrow> R (Rep (Abs r)) r"
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  using a unfolding Quotient_def
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  by blast
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lemma Quotient_rep_abs_fold_unmap: 
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  assumes "x' \<equiv> Abs x" and "R x x" and "Rep x' \<equiv> Rep' x'" 
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  shows "R (Rep' x') x"
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proof -
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  have "R (Rep x') x" using assms(1-2) Quotient_rep_abs by auto
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  then show ?thesis using assms(3) by simp
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qed
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lemma Quotient_Rep_eq:
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  assumes "x' \<equiv> Abs x" 
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  shows "Rep x' \<equiv> Rep x'"
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by simp
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lemma Quotient_rel_abs: "R r s \<Longrightarrow> Abs r = Abs s"
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  using a unfolding Quotient_def
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  by blast
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lemma Quotient_rel_abs2:
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  assumes "R (Rep x) y"
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  shows "x = Abs y"
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proof -
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  from assms have "Abs (Rep x) = Abs y" by (auto intro: Quotient_rel_abs)
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  then show ?thesis using assms(1) by (simp add: Quotient_abs_rep)
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qed
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lemma Quotient_symp: "symp R"
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  using a unfolding Quotient_def using sympI by (metis (full_types))
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lemma Quotient_transp: "transp R"
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  using a unfolding Quotient_def using transpI by (metis (full_types))
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lemma Quotient_part_equivp: "part_equivp R"
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by (metis Quotient_rep_reflp Quotient_symp Quotient_transp part_equivpI)
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end
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lemma identity_quotient: "Quotient (op =) id id (op =)"
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unfolding Quotient_def by simp 
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text {* TODO: Use one of these alternatives as the real definition. *}
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lemma Quotient_alt_def:
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  "Quotient R Abs Rep T \<longleftrightarrow>
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    (\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and>
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    (\<forall>b. T (Rep b) b) \<and>
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    (\<forall>x y. R x y \<longleftrightarrow> T x (Abs x) \<and> T y (Abs y) \<and> Abs x = Abs y)"
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apply safe
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (simp (no_asm_use) only: Quotient_def, fast)
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apply (rule QuotientI)
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apply simp
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apply metis
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apply simp
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apply (rule ext, rule ext, metis)
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done
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lemma Quotient_alt_def2:
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  "Quotient R Abs Rep T \<longleftrightarrow>
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    (\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and>
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    (\<forall>b. T (Rep b) b) \<and>
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    (\<forall>x y. R x y \<longleftrightarrow> T x (Abs y) \<and> T y (Abs x))"
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  unfolding Quotient_alt_def by (safe, metis+)
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lemma Quotient_alt_def3:
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  "Quotient R Abs Rep T \<longleftrightarrow>
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    (\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> (\<forall>b. T (Rep b) b) \<and>
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    (\<forall>x y. R x y \<longleftrightarrow> (\<exists>z. T x z \<and> T y z))"
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  unfolding Quotient_alt_def2 by (safe, metis+)
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lemma Quotient_alt_def4:
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  "Quotient R Abs Rep T \<longleftrightarrow>
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    (\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> (\<forall>b. T (Rep b) b) \<and> R = T OO conversep T"
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  unfolding Quotient_alt_def3 fun_eq_iff by auto
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lemma fun_quotient:
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  assumes 1: "Quotient R1 abs1 rep1 T1"
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  assumes 2: "Quotient R2 abs2 rep2 T2"
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  shows "Quotient (R1 ===> R2) (rep1 ---> abs2) (abs1 ---> rep2) (T1 ===> T2)"
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  using assms unfolding Quotient_alt_def2
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  unfolding fun_rel_def fun_eq_iff map_fun_apply
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  by (safe, metis+)
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lemma apply_rsp:
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  fixes f g::"'a \<Rightarrow> 'c"
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  assumes q: "Quotient R1 Abs1 Rep1 T1"
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  and     a: "(R1 ===> R2) f g" "R1 x y"
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  shows "R2 (f x) (g y)"
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  using a by (auto elim: fun_relE)
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lemma apply_rsp':
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  assumes a: "(R1 ===> R2) f g" "R1 x y"
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  shows "R2 (f x) (g y)"
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  using a by (auto elim: fun_relE)
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lemma apply_rsp'':
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  assumes "Quotient R Abs Rep T"
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  and "(R ===> S) f f"
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  shows "S (f (Rep x)) (f (Rep x))"
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proof -
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  from assms(1) have "R (Rep x) (Rep x)" by (rule Quotient_rep_reflp)
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  then show ?thesis using assms(2) by (auto intro: apply_rsp')
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qed
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subsection {* Quotient composition *}
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lemma Quotient_compose:
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  assumes 1: "Quotient R1 Abs1 Rep1 T1"
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  assumes 2: "Quotient R2 Abs2 Rep2 T2"
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  shows "Quotient (T1 OO R2 OO conversep T1) (Abs2 \<circ> Abs1) (Rep1 \<circ> Rep2) (T1 OO T2)"
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  using assms unfolding Quotient_alt_def4 by fastforce
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lemma equivp_reflp2:
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  "equivp R \<Longrightarrow> reflp R"
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  by (erule equivpE)
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subsection {* Respects predicate *}
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definition Respects :: "('a \<Rightarrow> 'a \<Rightarrow> bool) \<Rightarrow> 'a set"
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  where "Respects R = {x. R x x}"
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lemma in_respects: "x \<in> Respects R \<longleftrightarrow> R x x"
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  unfolding Respects_def by simp
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subsection {* Invariant *}
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definition invariant :: "('a \<Rightarrow> bool) \<Rightarrow> 'a \<Rightarrow> 'a \<Rightarrow> bool" 
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  where "invariant R = (\<lambda>x y. R x \<and> x = y)"
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lemma invariant_to_eq:
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  assumes "invariant P x y"
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  shows "x = y"
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using assms by (simp add: invariant_def)
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lemma fun_rel_eq_invariant:
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  shows "((invariant R) ===> S) = (\<lambda>f g. \<forall>x. R x \<longrightarrow> S (f x) (g x))"
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by (auto simp add: invariant_def fun_rel_def)
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lemma invariant_same_args:
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  shows "invariant P x x \<equiv> P x"
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using assms by (auto simp add: invariant_def)
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lemma UNIV_typedef_to_Quotient:
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  assumes "type_definition Rep Abs UNIV"
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  and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)"
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  shows "Quotient (op =) Abs Rep T"
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proof -
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  interpret type_definition Rep Abs UNIV by fact
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  from Abs_inject Rep_inverse Abs_inverse T_def show ?thesis 
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    by (fastforce intro!: QuotientI fun_eq_iff)
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qed
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lemma UNIV_typedef_to_equivp:
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  fixes Abs :: "'a \<Rightarrow> 'b"
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  and Rep :: "'b \<Rightarrow> 'a"
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  assumes "type_definition Rep Abs (UNIV::'a set)"
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  shows "equivp (op=::'a\<Rightarrow>'a\<Rightarrow>bool)"
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by (rule identity_equivp)
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lemma typedef_to_Quotient:
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  assumes "type_definition Rep Abs S"
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  and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)"
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  shows "Quotient (invariant (\<lambda>x. x \<in> S)) Abs Rep T"
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proof -
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  interpret type_definition Rep Abs S by fact
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  from Rep Abs_inject Rep_inverse Abs_inverse T_def show ?thesis
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    by (auto intro!: QuotientI simp: invariant_def fun_eq_iff)
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qed
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lemma typedef_to_part_equivp:
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  assumes "type_definition Rep Abs S"
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  shows "part_equivp (invariant (\<lambda>x. x \<in> S))"
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proof (intro part_equivpI)
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  interpret type_definition Rep Abs S by fact
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  show "\<exists>x. invariant (\<lambda>x. x \<in> S) x x" using Rep by (auto simp: invariant_def)
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next
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  show "symp (invariant (\<lambda>x. x \<in> S))" by (auto intro: sympI simp: invariant_def)
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next
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  show "transp (invariant (\<lambda>x. x \<in> S))" by (auto intro: transpI simp: invariant_def)
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qed
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lemma open_typedef_to_Quotient:
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  assumes "type_definition Rep Abs {x. P x}"
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  and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)"
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  shows "Quotient (invariant P) Abs Rep T"
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  using typedef_to_Quotient [OF assms] by simp
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lemma open_typedef_to_part_equivp:
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  assumes "type_definition Rep Abs {x. P x}"
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  shows "part_equivp (invariant P)"
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  using typedef_to_part_equivp [OF assms] by simp
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text {* Generating transfer rules for quotients. *}
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context
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  fixes R Abs Rep T
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  assumes 1: "Quotient R Abs Rep T"
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begin
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lemma Quotient_right_unique: "right_unique T"
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  using 1 unfolding Quotient_alt_def right_unique_def by metis
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huffman@47537
   325
lemma Quotient_right_total: "right_total T"
huffman@47537
   326
  using 1 unfolding Quotient_alt_def right_total_def by metis
huffman@47537
   327
huffman@47537
   328
lemma Quotient_rel_eq_transfer: "(T ===> T ===> op =) R (op =)"
huffman@47537
   329
  using 1 unfolding Quotient_alt_def fun_rel_def by simp
huffman@47376
   330
huffman@47538
   331
lemma Quotient_abs_induct:
huffman@47538
   332
  assumes "\<And>y. R y y \<Longrightarrow> P (Abs y)" shows "P x"
huffman@47538
   333
  using 1 assms unfolding Quotient_def by metis
huffman@47538
   334
huffman@47537
   335
end
huffman@47537
   336
huffman@47537
   337
text {* Generating transfer rules for total quotients. *}
huffman@47376
   338
huffman@47537
   339
context
huffman@47537
   340
  fixes R Abs Rep T
huffman@47537
   341
  assumes 1: "Quotient R Abs Rep T" and 2: "reflp R"
huffman@47537
   342
begin
huffman@47376
   343
huffman@47537
   344
lemma Quotient_bi_total: "bi_total T"
huffman@47537
   345
  using 1 2 unfolding Quotient_alt_def bi_total_def reflp_def by auto
huffman@47537
   346
huffman@47537
   347
lemma Quotient_id_abs_transfer: "(op = ===> T) (\<lambda>x. x) Abs"
huffman@47537
   348
  using 1 2 unfolding Quotient_alt_def reflp_def fun_rel_def by simp
huffman@47537
   349
huffman@47575
   350
lemma Quotient_total_abs_induct: "(\<And>y. P (Abs y)) \<Longrightarrow> P x"
huffman@47575
   351
  using 1 2 assms unfolding Quotient_alt_def reflp_def by metis
huffman@47575
   352
huffman@47889
   353
lemma Quotient_total_abs_eq_iff: "Abs x = Abs y \<longleftrightarrow> R x y"
huffman@47889
   354
  using Quotient_rel [OF 1] 2 unfolding reflp_def by simp
huffman@47889
   355
huffman@47537
   356
end
huffman@47376
   357
huffman@47368
   358
text {* Generating transfer rules for a type defined with @{text "typedef"}. *}
huffman@47368
   359
huffman@47534
   360
context
huffman@47534
   361
  fixes Rep Abs A T
huffman@47368
   362
  assumes type: "type_definition Rep Abs A"
huffman@47534
   363
  assumes T_def: "T \<equiv> (\<lambda>(x::'a) (y::'b). x = Rep y)"
huffman@47534
   364
begin
huffman@47534
   365
kuncar@51994
   366
lemma typedef_left_unique: "left_unique T"
kuncar@51994
   367
  unfolding left_unique_def T_def
kuncar@51994
   368
  by (simp add: type_definition.Rep_inject [OF type])
kuncar@51994
   369
huffman@47534
   370
lemma typedef_bi_unique: "bi_unique T"
huffman@47368
   371
  unfolding bi_unique_def T_def
huffman@47368
   372
  by (simp add: type_definition.Rep_inject [OF type])
huffman@47368
   373
kuncar@51374
   374
(* the following two theorems are here only for convinience *)
kuncar@51374
   375
kuncar@51374
   376
lemma typedef_right_unique: "right_unique T"
kuncar@51374
   377
  using T_def type Quotient_right_unique typedef_to_Quotient 
kuncar@51374
   378
  by blast
kuncar@51374
   379
kuncar@51374
   380
lemma typedef_right_total: "right_total T"
kuncar@51374
   381
  using T_def type Quotient_right_total typedef_to_Quotient 
kuncar@51374
   382
  by blast
kuncar@51374
   383
huffman@47535
   384
lemma typedef_rep_transfer: "(T ===> op =) (\<lambda>x. x) Rep"
huffman@47535
   385
  unfolding fun_rel_def T_def by simp
huffman@47535
   386
huffman@47534
   387
end
huffman@47534
   388
huffman@47368
   389
text {* Generating the correspondence rule for a constant defined with
huffman@47368
   390
  @{text "lift_definition"}. *}
huffman@47368
   391
huffman@47351
   392
lemma Quotient_to_transfer:
huffman@47351
   393
  assumes "Quotient R Abs Rep T" and "R c c" and "c' \<equiv> Abs c"
huffman@47351
   394
  shows "T c c'"
huffman@47351
   395
  using assms by (auto dest: Quotient_cr_rel)
huffman@47351
   396
kuncar@47982
   397
text {* Proving reflexivity *}
kuncar@47982
   398
kuncar@51994
   399
definition reflp' :: "('a \<Rightarrow> 'a \<Rightarrow> bool) \<Rightarrow> bool" where "reflp' R \<equiv> reflp R"
kuncar@47982
   400
kuncar@47982
   401
lemma Quotient_to_left_total:
kuncar@47982
   402
  assumes q: "Quotient R Abs Rep T"
kuncar@47982
   403
  and r_R: "reflp R"
kuncar@47982
   404
  shows "left_total T"
kuncar@47982
   405
using r_R Quotient_cr_rel[OF q] unfolding left_total_def by (auto elim: reflpE)
kuncar@47982
   406
kuncar@47982
   407
lemma reflp_Quotient_composition:
kuncar@51994
   408
  assumes "left_total R"
kuncar@51994
   409
  assumes "reflp T"
kuncar@51994
   410
  shows "reflp (R OO T OO R\<inverse>\<inverse>)"
kuncar@51994
   411
using assms unfolding reflp_def left_total_def by fast
kuncar@51994
   412
kuncar@51994
   413
lemma reflp_fun1:
kuncar@51994
   414
  assumes "is_equality R"
kuncar@51994
   415
  assumes "reflp' S"
kuncar@51994
   416
  shows "reflp (R ===> S)"
kuncar@51994
   417
using assms unfolding is_equality_def reflp'_def reflp_def fun_rel_def by blast
kuncar@51994
   418
kuncar@51994
   419
lemma reflp_fun2:
kuncar@51994
   420
  assumes "is_equality R"
kuncar@51994
   421
  assumes "is_equality S"
kuncar@51994
   422
  shows "reflp (R ===> S)"
kuncar@51994
   423
using assms unfolding is_equality_def reflp_def fun_rel_def by blast
kuncar@51994
   424
kuncar@51994
   425
lemma is_equality_Quotient_composition:
kuncar@51994
   426
  assumes "is_equality T"
kuncar@51994
   427
  assumes "left_total R"
kuncar@51994
   428
  assumes "left_unique R"
kuncar@51994
   429
  shows "is_equality (R OO T OO R\<inverse>\<inverse>)"
kuncar@51994
   430
using assms unfolding is_equality_def left_total_def left_unique_def OO_def conversep_iff
kuncar@51994
   431
by fastforce
kuncar@47982
   432
kuncar@52307
   433
lemma left_total_composition: "left_total R \<Longrightarrow> left_total S \<Longrightarrow> left_total (R OO S)"
kuncar@52307
   434
unfolding left_total_def OO_def by fast
kuncar@52307
   435
kuncar@52307
   436
lemma left_unique_composition: "left_unique R \<Longrightarrow> left_unique S \<Longrightarrow> left_unique (R OO S)"
kuncar@52307
   437
unfolding left_unique_def OO_def by fast
kuncar@52307
   438
kuncar@47982
   439
lemma reflp_equality: "reflp (op =)"
kuncar@47982
   440
by (auto intro: reflpI)
kuncar@47982
   441
kuncar@51374
   442
text {* Proving a parametrized correspondence relation *}
kuncar@51374
   443
kuncar@51374
   444
lemma eq_OO: "op= OO R = R"
kuncar@51374
   445
unfolding OO_def by metis
kuncar@51374
   446
kuncar@51374
   447
definition POS :: "('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> ('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> bool" where
kuncar@51374
   448
"POS A B \<equiv> A \<le> B"
kuncar@51374
   449
kuncar@51374
   450
definition  NEG :: "('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> ('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> bool" where
kuncar@51374
   451
"NEG A B \<equiv> B \<le> A"
kuncar@51374
   452
kuncar@51374
   453
(*
kuncar@51374
   454
  The following two rules are here because we don't have any proper
kuncar@51374
   455
  left-unique ant left-total relations. Left-unique and left-total
kuncar@51374
   456
  assumptions show up in distributivity rules for the function type.
kuncar@51374
   457
*)
kuncar@51374
   458
kuncar@51374
   459
lemma bi_unique_left_unique[transfer_rule]: "bi_unique R \<Longrightarrow> left_unique R"
kuncar@51374
   460
unfolding bi_unique_def left_unique_def by blast
kuncar@51374
   461
kuncar@51374
   462
lemma bi_total_left_total[transfer_rule]: "bi_total R \<Longrightarrow> left_total R"
kuncar@51374
   463
unfolding bi_total_def left_total_def by blast
kuncar@51374
   464
kuncar@51374
   465
lemma pos_OO_eq:
kuncar@51374
   466
  shows "POS (A OO op=) A"
kuncar@51374
   467
unfolding POS_def OO_def by blast
kuncar@51374
   468
kuncar@51374
   469
lemma pos_eq_OO:
kuncar@51374
   470
  shows "POS (op= OO A) A"
kuncar@51374
   471
unfolding POS_def OO_def by blast
kuncar@51374
   472
kuncar@51374
   473
lemma neg_OO_eq:
kuncar@51374
   474
  shows "NEG (A OO op=) A"
kuncar@51374
   475
unfolding NEG_def OO_def by auto
kuncar@51374
   476
kuncar@51374
   477
lemma neg_eq_OO:
kuncar@51374
   478
  shows "NEG (op= OO A) A"
kuncar@51374
   479
unfolding NEG_def OO_def by blast
kuncar@51374
   480
kuncar@51374
   481
lemma POS_trans:
kuncar@51374
   482
  assumes "POS A B"
kuncar@51374
   483
  assumes "POS B C"
kuncar@51374
   484
  shows "POS A C"
kuncar@51374
   485
using assms unfolding POS_def by auto
kuncar@51374
   486
kuncar@51374
   487
lemma NEG_trans:
kuncar@51374
   488
  assumes "NEG A B"
kuncar@51374
   489
  assumes "NEG B C"
kuncar@51374
   490
  shows "NEG A C"
kuncar@51374
   491
using assms unfolding NEG_def by auto
kuncar@51374
   492
kuncar@51374
   493
lemma POS_NEG:
kuncar@51374
   494
  "POS A B \<equiv> NEG B A"
kuncar@51374
   495
  unfolding POS_def NEG_def by auto
kuncar@51374
   496
kuncar@51374
   497
lemma NEG_POS:
kuncar@51374
   498
  "NEG A B \<equiv> POS B A"
kuncar@51374
   499
  unfolding POS_def NEG_def by auto
kuncar@51374
   500
kuncar@51374
   501
lemma POS_pcr_rule:
kuncar@51374
   502
  assumes "POS (A OO B) C"
kuncar@51374
   503
  shows "POS (A OO B OO X) (C OO X)"
kuncar@51374
   504
using assms unfolding POS_def OO_def by blast
kuncar@51374
   505
kuncar@51374
   506
lemma NEG_pcr_rule:
kuncar@51374
   507
  assumes "NEG (A OO B) C"
kuncar@51374
   508
  shows "NEG (A OO B OO X) (C OO X)"
kuncar@51374
   509
using assms unfolding NEG_def OO_def by blast
kuncar@51374
   510
kuncar@51374
   511
lemma POS_apply:
kuncar@51374
   512
  assumes "POS R R'"
kuncar@51374
   513
  assumes "R f g"
kuncar@51374
   514
  shows "R' f g"
kuncar@51374
   515
using assms unfolding POS_def by auto
kuncar@51374
   516
kuncar@51374
   517
text {* Proving a parametrized correspondence relation *}
kuncar@51374
   518
kuncar@51374
   519
lemma fun_mono:
kuncar@51374
   520
  assumes "A \<ge> C"
kuncar@51374
   521
  assumes "B \<le> D"
kuncar@51374
   522
  shows   "(A ===> B) \<le> (C ===> D)"
kuncar@51374
   523
using assms unfolding fun_rel_def by blast
kuncar@51374
   524
kuncar@51374
   525
lemma pos_fun_distr: "((R ===> S) OO (R' ===> S')) \<le> ((R OO R') ===> (S OO S'))"
kuncar@51374
   526
unfolding OO_def fun_rel_def by blast
kuncar@51374
   527
kuncar@51374
   528
lemma functional_relation: "right_unique R \<Longrightarrow> left_total R \<Longrightarrow> \<forall>x. \<exists>!y. R x y"
kuncar@51374
   529
unfolding right_unique_def left_total_def by blast
kuncar@51374
   530
kuncar@51374
   531
lemma functional_converse_relation: "left_unique R \<Longrightarrow> right_total R \<Longrightarrow> \<forall>y. \<exists>!x. R x y"
kuncar@51374
   532
unfolding left_unique_def right_total_def by blast
kuncar@51374
   533
kuncar@51374
   534
lemma neg_fun_distr1:
kuncar@51374
   535
assumes 1: "left_unique R" "right_total R"
kuncar@51374
   536
assumes 2: "right_unique R'" "left_total R'"
kuncar@51374
   537
shows "(R OO R' ===> S OO S') \<le> ((R ===> S) OO (R' ===> S')) "
kuncar@51374
   538
  using functional_relation[OF 2] functional_converse_relation[OF 1]
kuncar@51374
   539
  unfolding fun_rel_def OO_def
kuncar@51374
   540
  apply clarify
kuncar@51374
   541
  apply (subst all_comm)
kuncar@51374
   542
  apply (subst all_conj_distrib[symmetric])
kuncar@51374
   543
  apply (intro choice)
kuncar@51374
   544
  by metis
kuncar@51374
   545
kuncar@51374
   546
lemma neg_fun_distr2:
kuncar@51374
   547
assumes 1: "right_unique R'" "left_total R'"
kuncar@51374
   548
assumes 2: "left_unique S'" "right_total S'"
kuncar@51374
   549
shows "(R OO R' ===> S OO S') \<le> ((R ===> S) OO (R' ===> S'))"
kuncar@51374
   550
  using functional_converse_relation[OF 2] functional_relation[OF 1]
kuncar@51374
   551
  unfolding fun_rel_def OO_def
kuncar@51374
   552
  apply clarify
kuncar@51374
   553
  apply (subst all_comm)
kuncar@51374
   554
  apply (subst all_conj_distrib[symmetric])
kuncar@51374
   555
  apply (intro choice)
kuncar@51374
   556
  by metis
kuncar@51374
   557
kuncar@51956
   558
subsection {* Domains *}
kuncar@51956
   559
kuncar@51956
   560
lemma pcr_Domainp_par_left_total:
kuncar@51956
   561
  assumes "Domainp B = P"
kuncar@51956
   562
  assumes "left_total A"
kuncar@51956
   563
  assumes "(A ===> op=) P' P"
kuncar@51956
   564
  shows "Domainp (A OO B) = P'"
kuncar@51956
   565
using assms
kuncar@51956
   566
unfolding Domainp_iff[abs_def] OO_def bi_unique_def left_total_def fun_rel_def 
kuncar@51956
   567
by (fast intro: fun_eq_iff)
kuncar@51956
   568
kuncar@51956
   569
lemma pcr_Domainp_par:
kuncar@51956
   570
assumes "Domainp B = P2"
kuncar@51956
   571
assumes "Domainp A = P1"
kuncar@51956
   572
assumes "(A ===> op=) P2' P2"
kuncar@51956
   573
shows "Domainp (A OO B) = (inf P1 P2')"
kuncar@51956
   574
using assms unfolding fun_rel_def Domainp_iff[abs_def] OO_def
kuncar@51956
   575
by (fast intro: fun_eq_iff)
kuncar@51956
   576
kuncar@51956
   577
definition rel_pred_comp :: "('a => 'b => bool) => ('b => bool) => 'a => bool"  (infixr "OP" 75)
kuncar@51956
   578
where "rel_pred_comp R P \<equiv> \<lambda>x. \<exists>y. R x y \<and> P y"
kuncar@51956
   579
kuncar@51956
   580
lemma pcr_Domainp:
kuncar@51956
   581
assumes "Domainp B = P"
kuncar@51956
   582
shows "Domainp (A OO B) = (A OP P)"
kuncar@51956
   583
using assms unfolding rel_pred_comp_def by blast
kuncar@51956
   584
kuncar@51956
   585
lemma pcr_Domainp_total:
kuncar@51956
   586
  assumes "bi_total B"
kuncar@51956
   587
  assumes "Domainp A = P"
kuncar@51956
   588
  shows "Domainp (A OO B) = P"
kuncar@51956
   589
using assms unfolding bi_total_def 
kuncar@51956
   590
by fast
kuncar@51956
   591
kuncar@51956
   592
lemma Quotient_to_Domainp:
kuncar@51956
   593
  assumes "Quotient R Abs Rep T"
kuncar@51956
   594
  shows "Domainp T = (\<lambda>x. R x x)"  
kuncar@51956
   595
by (simp add: Domainp_iff[abs_def] Quotient_cr_rel[OF assms])
kuncar@51956
   596
kuncar@51956
   597
lemma invariant_to_Domainp:
kuncar@51956
   598
  assumes "Quotient (Lifting.invariant P) Abs Rep T"
kuncar@51956
   599
  shows "Domainp T = P"
kuncar@51956
   600
by (simp add: invariant_def Domainp_iff[abs_def] Quotient_cr_rel[OF assms])
kuncar@51956
   601
kuncar@47308
   602
subsection {* ML setup *}
kuncar@47308
   603
wenzelm@48891
   604
ML_file "Tools/Lifting/lifting_util.ML"
kuncar@47308
   605
wenzelm@48891
   606
ML_file "Tools/Lifting/lifting_info.ML"
kuncar@47308
   607
setup Lifting_Info.setup
kuncar@47308
   608
kuncar@51994
   609
lemmas [reflexivity_rule] = 
kuncar@52036
   610
  reflp_equality reflp_Quotient_composition is_equality_Quotient_composition 
kuncar@52307
   611
  left_total_fun left_unique_fun left_total_eq left_unique_eq left_total_composition
kuncar@52307
   612
  left_unique_composition
kuncar@51994
   613
kuncar@51994
   614
text {* add @{thm reflp_fun1} and @{thm reflp_fun2} manually through ML
kuncar@51994
   615
  because we don't want to get reflp' variant of these theorems *}
kuncar@51994
   616
kuncar@51994
   617
setup{*
kuncar@51994
   618
Context.theory_map 
kuncar@51994
   619
  (fold
kuncar@51994
   620
    (snd oo (Thm.apply_attribute Lifting_Info.add_reflexivity_rule_raw_attribute)) 
kuncar@51994
   621
      [@{thm reflp_fun1}, @{thm reflp_fun2}])
kuncar@51994
   622
*}
kuncar@51374
   623
kuncar@51374
   624
(* setup for the function type *)
kuncar@47777
   625
declare fun_quotient[quot_map]
kuncar@51374
   626
declare fun_mono[relator_mono]
kuncar@51374
   627
lemmas [relator_distr] = pos_fun_distr neg_fun_distr1 neg_fun_distr2
kuncar@47308
   628
wenzelm@48891
   629
ML_file "Tools/Lifting/lifting_term.ML"
kuncar@47308
   630
wenzelm@48891
   631
ML_file "Tools/Lifting/lifting_def.ML"
kuncar@47308
   632
wenzelm@48891
   633
ML_file "Tools/Lifting/lifting_setup.ML"
kuncar@47308
   634
kuncar@51994
   635
hide_const (open) invariant POS NEG reflp'
kuncar@47308
   636
kuncar@47308
   637
end